The NPSH refers to the excess energy of the liquid per unit weight exceeding the vaporization pressure at the inlet of the gear pump. Popular is in the pump inlet, if the pressure is less than a certain value, the water will vaporize, and after vaporization, it will undermine the pump (the pump into N holes). The NPSHa means that it is normal, and if the installation height of the pump is small, the value of the NPSHa is relatively small. Effective NPSH is the device NPSHa, the larger the more difficult to cavitation. Gear pump in the liquid at the impeller at the entrance due to a certain vacuum pressure will produce vapor, vaporization of bubbles in the liquid particle impact movement, the impeller and other metal surfaces produce erosion, which damage the impeller and other metal gear pump in the work When the liquid at the impeller inlet due to a certain vacuum pressure will produce vapor, vaporization of bubbles in the liquid particle impact movement, the impeller and other metal surface erosion, thus undermining the impeller and other metals, vacuum pressure at this time is called vaporization pressure, The NPSH refers to the surplus energy of the liquid per unit weight exceeding the vaporization pressure at the suction inlet of the pump. Units marked with meters, with (NPSH) r. Suction stroke is required NPSH Δh: That is, the degree of vacuum that the pump allows liquid to be sucked in, that is, the allowable installation height of the pump, in meters. Calculated formula is: Stroke = standard atmospheric pressure (10.33 meters) - NPSH - safe amount (0.5 meters) (standard atmospheric pressure can depress the pipeline vacuum height 10.33 meters)
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